syzbot


KCSAN: data-race in step_into / vfs_unlink (2)
Status: auto-closed as invalid on 2022/05/11 15:48
Reported-by: syzbot+9f01ba8f686219148901@syzkaller.appspotmail.com
First crash: 705d, last: 49d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in step_into / vfs_unlink 11 708d 757d 0/22 closed as invalid on 2020/06/18 14:24

Sample crash report:
==================================================================
BUG: KCSAN: data-race in step_into / vfs_unlink

write to 0xffff88812f588a80 of 4 bytes by task 25672 on cpu 1:
 dont_mount include/linux/dcache.h:348 [inline]
 vfs_unlink+0x2c6/0x580 fs/namei.c:4152
 do_unlinkat+0x278/0x540 fs/namei.c:4218
 __do_sys_unlink fs/namei.c:4266 [inline]
 __se_sys_unlink fs/namei.c:4264 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4264
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812f588a80 of 4 bytes by task 1443 on cpu 0:
 __d_entry_type include/linux/dcache.h:385 [inline]
 d_is_symlink include/linux/dcache.h:415 [inline]
 step_into+0x171/0xf70 fs/namei.c:1854
 walk_component+0x1a1/0x360 fs/namei.c:2026
 lookup_last fs/namei.c:2475 [inline]
 path_lookupat+0x12d/0x3d0 fs/namei.c:2499
 filename_lookup+0x130/0x310 fs/namei.c:2528
 user_path_at_empty+0x3e/0x110 fs/namei.c:2851
 do_readlinkat+0x97/0x210 fs/stat.c:457
 __do_sys_readlink fs/stat.c:490 [inline]
 __se_sys_readlink fs/stat.c:487 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:487
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00600008 -> 0x00008008

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1443 Comm: udevd Not tainted 5.18.0-rc1-syzkaller-00016-g3e732ebf7316-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1081):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/04/06 15:47 upstream 3e732ebf7316 97582466 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/06 09:47 upstream 3e732ebf7316 86b4b7f8 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/05 19:44 upstream ce4c854ee868 0127c10f .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/05 15:30 upstream 312310928417 0127c10f .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/04 16:00 upstream 312310928417 5915c2cb .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/04 06:03 upstream 09bb8856d4a7 79a2a8fc .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/02 23:34 upstream be2d3ecedd99 79a2a8fc .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/02 08:30 upstream 88e6c0207623 79a2a8fc .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/01 20:14 upstream d0d642a5d365 79a2a8fc .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/01 15:08 upstream e8b767f5e040 79a2a8fc .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/04/01 03:02 upstream e8b767f5e040 68fc921a .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/31 13:03 upstream 787af64d05cd c4c32d8c .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/31 01:07 upstream 74164d284b29 9d49f3a7 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/30 10:10 upstream d888c83fcec7 42718dd6 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/30 08:26 upstream d888c83fcec7 6bdac766 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/29 14:47 upstream 1930a6e739c4 6bdac766 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/28 23:15 upstream ae085d7f9365 6bdac766 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/28 00:37 upstream f82da161ea75 89bc8608 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/27 10:10 upstream f022814633e1 89bc8608 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/26 20:49 upstream bddac7c1e02b 89bc8608 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/26 03:06 upstream 52d543b5497c 89bc8608 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/25 13:18 upstream 34af78c4e616 89bc8608 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/24 23:47 upstream 52deda9551a0 89bc8608 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/24 10:57 upstream ed4643521e6a 89bc8608 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/23 22:59 upstream 6b1f86f8e9c7 5ff41e94 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/23 07:09 upstream 3bf03b9a0839 5ff41e94 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/22 14:30 upstream b47d5a4f6b8d d88ef0c5 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/22 12:27 upstream b47d5a4f6b8d e2d91b1d .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/21 22:32 upstream eaa54b1458ca e2d91b1d .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/21 06:38 upstream f443e374ae13 e2d91b1d .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/20 18:21 upstream 14702b3b2438 e2d91b1d .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/19 19:58 upstream 97e9c8eb4bb1 e2d91b1d .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/19 04:00 upstream 34e047aa16c0 e2d91b1d .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/18 02:37 upstream 551acdc3c3d2 e2d91b1d .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/17 08:25 upstream 56e337f2cf13 dfa9a8ed .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/16 14:30 upstream 56e337f2cf13 46cc3b21 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/15 18:57 upstream 56e337f2cf13 9e8eaa75 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/14 09:12 upstream 09688c0166e7 9e8eaa75 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/14 01:53 upstream f0e18b03fcaf 9e8eaa75 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/13 01:53 upstream aad611a868d1 9e8eaa75 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/12 08:32 upstream 68453767131a 9e8eaa75 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2022/03/11 06:57 upstream 79b00034e9dc 9e8eaa75 .config log report info KCSAN: data-race in step_into / vfs_unlink
ci2-upstream-kcsan-gce 2021/01/17 10:14 upstream 0da0a8a0a0e1 813be542 .config log report info
ci2-upstream-kcsan-gce 2020/08/02 09:37 upstream ac3a0c847296 96dd3623 .config log report
ci2-upstream-kcsan-gce 2020/08/02 06:03 upstream d52daa8620c6 8df85ed9 .config log report
ci2-upstream-kcsan-gce 2020/06/19 18:31 upstream 5e857ce6eae7 123cf502 .config log report